稀土-HEDTA-丝氨酸三元体系的pH电位法和荧光光谱研究  

STUDY ON RARE EARTH-HEDTA-SERINE TERNARY SYSTEM BY POTENTIOMETRY AND FLUORESCENCE SPECTROSCOPY

作　　者：高峰[1] 牛春吉[1] 倪嘉缵[1] 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《物理化学学报》1991年第3期362-365,共4页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

摘　　要：氨基多羧酸是镧、锕系元素促排剂,氨基酸是重要的生物配体。稀土-氨基多羧酸-氨基酸三元体系的研究对探索稀土在人体内代谢及其生物效应具有重要意义,其次,多元配位体系荧光研究亦是令人感兴趣的课题。有关稀土-氨基多羧酸-氨基酸三元体系研究不多,稀土-N-羟乙基乙二胺三乙酸(HEDTA)-丝氨酸(Ser)三元体系研究尚未见报导。本文用pH电位法和荧光光谱研究了稀土(除钷外镧系元素及钇)-HEDTA-Ser三元体系的配位作用,考察了铽配合物配体敏化荧光光谱特点。In this paper a rare earth-HEDTA-serine (Ser) ternary system has been studied by potentiometric titration at 25℃ with an ionic strength of 0.15 mol·L^(-1)(NaCl). The excitation and fluorescence spectra of TbCl_3, Tb-Ser,Tb-HEDTA and Tb-HEDTA-Ser have been determined at room temperature. The stability constants of these ternary complexes have been obtained. It has been found that Tb-HEDTA-Ser ternary system exhibit scharacteristic fluorescence spectrum of Tb^(3+) sensitized by two ligands. The results mean that the chemical bond between the central ion and the ligand in this ternary system is predominantly ionic in character,and the energy transfer from ligand to Tb^(3+) is performed by a kind of short-range electron exchange action.

关 键 词：稀土元素 HEDTA 丝氨酸 PH电位法 

分 类 号：Q581[生物学—生物化学]